RFR: 8345289: RISC-V: enable some extensions with hwprobe

[Hamlin Li]

Hi,
Can you help to review the patch?
Currently, some extensions are not enable automatically with hwprobe, this is to enable them with hwprobe result.

Thanks!

Tests running so far so good.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/22474/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22474&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345289
  Stats: 17 lines in 3 files changed: 16 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22474.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22474/head:pull/22474

PR: https://git.openjdk.org/jdk/pull/22474